In Perl:
my $string = "This is a test";
say "String matches" if $string =~ /this is a test/; # Doesn't print
say "String sort of matches" if string =~ /this is a test/i; # Prints
my $string = "This is a test";
say "
阅读背景：
Perl RE匹配：如何将变量用于RE标志？
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